Haemophilic man marries a normal woman. Their offsprings will be
Correct answer: D. All normal
- A. All haemophilic
- B. All boys haemophilic
- C. All girls haemophilic
- D. All normal
Explanation
In a marriage between a hemophilic man and a normal woman, all of their offspring will be normal. Sons inherit the Y chromosome from their father and one X from their mother, making them normal. Daughters inherit one X from the father and one X from the mother, making them carriers of hemophilia. Hemophilic offspring can only occur if the mother is a carrier of the hemophilia gene.
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About Inheritance
Mendel's laws explain segregation, independent assortment and the prediction of genetic ratios using alleles, genotypes and phenotypes. The chapter also covers linked genes, recombination and crossing over during meiosis, then applies pedigree reasoning to X-linked recessive traits, which show different inheritance patterns in males and females.
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